A short‐duration cooling event around the tropical tropopause and its effect on water vapor
A short‐duration cooling event around the tropical tropopause and its effect on water vapor
复制标题
热带对流层顶周围的短时变冷事件及其对水汽的影响
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
W. Read
中科院分区：
文献类型：
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作者：
H. Takashima;N. Eguchi;W. Read
在2008/2009年冬季，COSMIC在2009年2月初在西太平洋和东太平洋-南美洲上空观测到热带对流层顶附近的极低温度，这与对热带热源的波响应有关。同时，Aura MLS探测到的83 hPa水汽场也出现极小值，而CALIOP观测到的卷云出现频率较高。虽然最低温度在事件发生后迅速消失，但一种可能的解释是低水蒸气浓度保持在这个水平，并逐渐扩散到整个热带地区，最终影响到大气磁带记录器的冷相。然而，需要进一步的研究来建立水蒸气大规模减少与2月初寒冷事件期间发生的脱水之间的联系。
For the 2008/2009 winter, extremely low temperatures near the tropical tropopause (∼83 hPa) were observed at the beginning of February 2009 by COSMIC over the western Pacific and over eastern Pacific‐South America in association with a wave response to the tropical heat source. At the same time, the water vapor field at 83 hPa detected from Aura MLS recorded a minimum, with a higher frequency of cirrus cloud observed by CALIOP. Although the temperature minima rapidly disappeared after the event, one possible interpretation is that the low water‐vapor concentration remained at this level and spread gradually over the entire tropics, finally impacting on the cold phase of the atmospheric tape recorder. However, further study is required to establish a link between the large‐scale reduction in water vapor and the dehydration that occurred during the cold event in early February.